Michael Evzelman

• Ph.D.
• Research Scientist at Ben-Gurion University of the Negev

An innovative analog frontend for big data collection and intelligent compression as part of an instantaneous failure prediction platform is presented. Failure prediction in power management systems is crucial for increasing uptime and preventing massive failure. Accurate failure prediction, with real-time decision-making, requires data collection...

A non-isolated high conversion ratio boost extending method is presented. The extender approach hinges on the stacking of series capacitors, to achieve high voltage gain, along with high efficiency. The series capacitor stacking method, facilitates a high efficiency single cycle energy conversion that eliminates the need in multiple consecutive con...

This paper introduces a new low voltage sub-nanosecond monolithic pulsed current driver for light detection and ranging (LIDAR) applications. A unique architecture based on a controlled current source and Vernier activation sequence, combined with a monolithic implementation, allow operation from low input voltage levels, high-resolution pico-secon...

This paper introduces a new zero current switching (ZCS) topology for parallel balancing of serially connected batteries string. The main advantage of the balancing concept in this study is that energy is transferred only when the cells are unbalanced. As a result, the power losses are significantly reduced since no current circulates through the s...

This paper presents a hardware efficient realization of a low power grid-tied power supply. The SMPS is enabled through flyback configuration accompanied by simple control circuitry for voltage-dependent constant on-time, which have been designed to maximize power density. It also includes start and power up circuits to enable operation from 85Vac...

Electric-drive vehicles, including hybrid, plug-in hybrid, and electric vehicles, require a high-voltage (HV) battery pack for propulsion and a low-voltage (LV) dc bus for auxiliary loads. This paper presents an architecture that uses modular dc-dc bypass converters to perform active battery cell balancing and to supply current to auxiliary loads,...

A new series-parallel switched capacitor converter topology capable of operating off two independent input sources and generating target output voltage in buck or boost mode is presented. Operation principle, conversion ratios, modelling considerations in different operation modes and extensive loss analysis are derived. The converter is robust and...

This paper introduces a unified modeling methodology to describe and explore the loss mechanism of resonant Switched Capacitor Converter (SCC) operating in a self-commutation zero current switching mode. The conventional equivalent resistance concept, which assumes a single conduction path of the resonant current, is generalized and extended to mod...

Large strings of battery cells require a conditioning system to avoid parameter divergence, especially for Lithium based battery cells. The development procedure of a real time, central-control system with a high control loop rate, sophisticated battery internal state estimation, low cost and short developing time is presented. The method is based...

Cell balancing circuits are required in battery packs to equalize the state-of-charge (SOC) of series-connected cells. This paper presents a control strategy for a modular cell balancing architecture based on low-voltage bypass dc-dc converters that perform real-time active cell balancing using a shared low-voltage (LV) bus. Each bypass converter i...

In many applications of class-E converters, custom-made design of the isolation resonant network is impractical; instead, off-shelf products are used. In this case, matching the target output parameters to the converter component stresses requires an additional passive matching network. The design of this network has a tedious optimisation routine...

A resonant switched capacitor converter (RSCC) with high efficiency over a wide and continuous conversion ratio range is introduced. The efficiency of the topology depends primarily on the conduction losses and is decoupled, to a large extent, from the voltage conversion ratio. This is an advantage over classical switched capacitor converters, for...

Energy storage systems require battery cell balancing circuits to avoid divergence of cell state of charge (SOC). A modular approach based on distributed continuous cell-level control is presented that extends the balancing function to higher level pack performance objectives such as improving power capability and increasing pack lifetime. This is...

A topology, control algorithm and self-tuning calibration procedure are presented for a two stage resonant driver that generates precise sinusoidal pulse trains for piezoelectric loads. The power stage consists of a PWM Boost followed by a variable frequency half bridge resonant inverter. The resonant tank consists of three inductors engaged on dem...

Electric-drive vehicles, including hybrid (HEV), plug-in hybrid (PHEV) and electric vehicles (EV), require a high-voltage (HV) battery pack for propulsion, and a low-voltage (LV) dc bus for auxiliary loads. This paper presents an architecture that uses modular dc-dc bypass converters to perform active battery cell balancing and to supply current to...

This paper introduces a unified modeling methodology to describe and explore the loss mechanism of resonant Switched Capacitor Converter (SCC) operating in a self-commutation zero current switching. The conventional equivalent resistance concept, which assumes a single conduction path of the resonant current, is generalized to model the losses in c...

A behavioral average-circuit model that analyzes hybrid converters that include a switched inductor and switched capacitors is presented. The model can be used to calculate or to simulate the average static, dynamic, and small-signal responses of hybrid converters. The model is valid for all operation modes of the switched capacitor converters (SCC...

A resonant switched capacitor converter with high efficiency over a wide and continuous conversion ratio is introduced. The efficiency of the topology depends primarily on the conduction losses and is decoupled, to a large extent, from the voltage conversion ratio. This is an advantage over classical switched capacitor converters in which the effic...

In many applications of class-E converters, custom made design of the isolation resonant network is impractical and off-shelf products are used. In this case, matching between the target output parameters and converter components requires an additional passive matching network that its parameters are found by a tedious optimization routine. This pa...

A generic modeling methodology that analyzes the losses in switched capacitor converters (SCC) operating in open loop was developed and verified by simulation and experiments. The proposed analytical approach is unified, covering both hard- and soft-SCC topologies that include active switches and/or diodes. An important feature of the proposed mode...

An alternative control method for a Boost Active Power Factor Corrector (APFC) operating in Continuous Conduction Mode is presented, analyzed and verified by simulation and experiments. The proposed APFC scheme employs average current control to shape the input current. The power level is adjusted by modulating the amplitude of a triangular carrier...

The contribution of the rise and fall times of switches to the losses of Switched Capacitors Converters was evaluated by an approximate analysis applying the equivalent resistance concept. It was found that switch turn-on and turn-off durations increase the equivalent resistance of the converter and, consequently, the losses, except in the case...

A switched-capacitor based equalization scheme is proposed for overcoming the adverse effect of shaded panels in a serially connected PV array. The proposed solution is based on a modular approach, in which each two panels are connected to a resonant switched-capacitor converter. The distribution of currents and power extraction improvement h...

A generic behavioral average-circuit model that analyzes hybrid converters that include a switched inductor and switched capacitors is developed. The model can be used to calculate or to simulate the average static, dynamic and small signal responses of hybrid converters. The model is valid for all operation modes of the Switched Capacitor Con...

A generic behavioral average circuit model of a Switched Capacitor Converter (SCC) is proposed and verified. The model is based on the average currents concept and assumes that each of the SCC subcircuits can be described or approximated as a first order network. The model can be used to calculate or simulate the average static, dynamic and sm...

A generic average model that is capable of predicting the static, large signal dynamics and small signal response of Switched Capacitor Converters (SCC) was developed and tested. The proposed model was verified by full circuit simulation and experimentally, and good agreement was found between the results. The model was used to study dynamic...

Switched Capacitor Converters (SCC) losses are analyzed and the rules for the selection of SCC parameters (such as switch resistances, capacitors values and switching frequency) to meet specific efficiency requirements, are developed. This is done by first applying an advanced methodology for calculating the equivalent resistance (R_e) of...

A generic modeling methodology that analyzes the losses in Switched Capacitors Converters (SCC) was developed and verified by simulation and experiments. The proposed analytical approach is unified, covering both hard and soft switched SCC topologies. The major advantage of the proposed model is that it expresses the losses as a function of the cur...

A generic model of a double bridge "AC inductor" based Gyrator-behaved APFC is presented, analyzed and verified by simulation and experiments. Based on the results of the study, a design procedure is developed for specifying the control law and the optimal parameters for ZVS and minimum conduction losses of the proposed APFC. The proposed APFC requ...

An alternative control method for a boost active power factor corrector (APFC) operating in continuous conduction mode is presented, analyzed and verified by simulation and experiments. The proposed APFC scheme employs average current control to shape the input current. The power level is adjusted by modulating the amplitude of a triangular carrier...

Recent advances in DSP technology, such as those found in the TI C2000 family, make possible the practical exploration and eventual economical implementation of switch mode converters topologies that, until now, were conceived as a curiosity or at best, of theoretical value only. Applying the DSP capabilities, we explored in this study the characte...